How Roger Federer became one of the few sports figures to make $1 billion.

On Thursday, one of tennis' greatest players, Roger Federer, announced his retirement. He was most dominating between 2003 and 2007,

winning 10 Majors, including Wimbledon five times. He won 20 Grand Slam tournaments.

Federer earned more than $1 billion in his career, including $870 million off the court and $130.6 million from playing tennis.

 He is one of just six athletes to have ever earned more than $1 billion, according to Forbes.

Federer remarked in his announcement of his retirement, "I am 41 years old, I have played more than 1,500 matches over 24 years,

and tennis has treated me more kindly than I ever would have dreamed.

His success off the court was obviously a continuation of his skill there. But according to marketing experts, there was more to it than just being a great player.

He was more enticing to businesses because of the way he held himself, which was distinguished by a certain demeanor and nobility.

During the past roughly 20 years, more than a dozen companies have partnered with Federer, 

a Swiss citizen, most notably Wilson Sporting Goods, Nike, Rolex, and Mercedes-Benz.